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naresh850
Joined: 09 Jun 2006
Posts: 138
Helped: 1
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 04 Apr 2008 7:54 Can ISR call semaphore? |
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Hello
Can ISR call semaphore?
Regards,
NP
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ariyan
Joined: 24 Aug 2006
Posts: 71
Helped: 2
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| 04 Apr 2008 10:32 Can ISR call semaphore? |
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You can't call an semaphore from within an ISR. Taking a semaphore is a blockable operation. The rule of thumb is, when in an interrupt do not block.
ISR can only send Messages and can only release a semaphore.
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intrepido
Joined: 04 May 2004
Posts: 19
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| 08 Apr 2008 13:49 Re: Can ISR call semaphore? |
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An ISR can do only non-blocking calls.
I.E.
An ISR can put an event into mail box without blocking.
NOTE.
Is very important for an ISR to spent small time to complete her operations.
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ivar4ever
Joined: 12 Jun 2006
Posts: 309
Helped: 72
Location: India
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| 14 Apr 2008 13:12 Re: Can ISR call semaphore? |
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| it is not advisable to call semaphones from ISR's
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xyz99002
Joined: 31 May 2001
Posts: 35
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| 25 Apr 2008 4:53 Re: Can ISR call semaphore? |
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| In most cases you can raise a semaphore from ISR but can not pend on it. Check your RTOS documentation.
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